Blowpipe tip



May 31, 1927. 1,631,007

J. H. BUCKNAM BLOWPIPE TIP Filed Sept. 1.- 1922 I llll B at ented May JAMES H. woman, or mass? CITY, New JERSEY, assrenon, BY DIRECT Ann mnsnn assrenmnn'rs, or ONE-HALF 'ro 'rnn'mnnn AIR rnonoc'rs COBPORATION OF OHIO, AND ONE-HALF TO THE HARRIS OALORIFIC COMP? is OLEVELAND, OHIO, A. CORPORATION OF OHIO.

' BLOWPIPE m.

Application filed September 7 This invention relates to blowpipes and particularly to improved ti'ps therefor.

Fuel gas passages or bores of blowpipe tips have'he-retofore been either of uniform diameter or contracted at their outlet orifices.

These'passages' are usually arranged in the axes of welding tips, while in cutting tips I an oxidizing passage .is usually arranged in the axis ofthe tip and one or more preheatmg or fuel gas passages are disposed substantially parallel or at 'a slight angle of from 1 to 2 degrees to the central passage. Fuel gases, such as a .mixture of acetylene;

and oxygen, have generally been used in 1 welding and cutting blowpip'es equipped with such tips, but when other fuel gases having a slower rate of combustion and a lower flame temperature are employed in suchtips, the resultsobtained are not enof concentrating the flames on a common center and also because of'the tendency of the flame to blow out when suficient oxygen is used to insure rapidpreheating in a cutting torch or a high heat in welding torches- The primary ob'ect of this-invention is, therefore, to provi e a blowpipe tip adapted to produce a more satisfactory welding or preheating jet, especially when fuel gases are used which have a lower flame tempera ture and slower rate of combustion than acetylene.

'. The above and other advantages and the novel features ofthe invention will be apand 2 may consist of a,copper, brass or other suitable body havingthe usual flange .or shoulder F at one end whereby it may be coupled to a welding blowpipehead in a well known manner. A fuel gaspassage or'bore P, which may be of substantially uniform cross-section, extends axially longitudinally tirely satisfactory because of the difficulty' whereby it may be coupled-to a hea 1, 1922. Serial No. 585,785. I

through the body of the tip and is adapted to receive the usual combustible mixture at its entrance from the blowpipe head. Heretoiqre this passage has been of a uniform diameter in some types of tips and'in others the diameter of the passage at the outlet orifice has been contracted.- According to the present invention a counterbore B is drilled into the tip toproduce an outlet orifice for the passage P that is coaxial with-as well as similar and larger in section than the main portion of the passage. This counter-bgre B provides an abrupt enlargement that is'des irably about twice the diameter of Y the main part of the passage P and about-as deep asthe diameter of the counterbore, but may be made of other dimensions.

The cutting tip T illustrated in Figs. '3

and 4 consists ofa body of brass or copper.

and is also provided with a suitable shoulder or flange F whereby it may be coupled to the head of a cutting blowpipe so that a central passage 0 therein will communicate with means for supplying a suitable oxidizing gas such as oxygen, and so that the inlets of the passages P may communicate with suitable fuel gas supplying means. The heatin or. fuel gas passages P are grouped aroun theicentral passage 0 in the same tip body and maybe disposed parallel thereto to supply a'clrcular series of jets around the oxidizing jet to preheat the metal to be cut' by the oxidizing jet. Each of the pas-' sages P is counterbored at its-orifice end as at B to provide ane'nlarged outlet onfice or recess for each preheating passage adjacent and in the same face ofthe tip body -with the outlet orifice of theoxidizing gas passage. The delivery'end of each passage P opens substantially centrally into. its recess, that is to say, at a'point about midway between the inner and outer edges of such recess. The dimensions of these individual counterbbores or recesses B may correspond to the one illustrated in Figs. 1 and 2 already described.

The cutting tip T illustrated in Figs.

5, 6 and 7 comprises a hollow copper or. brass shell- S provided with. a flan e, S

with a central passage 0; for oxidizing gas.

Other assages for fuel gas may be grouped ,aroun the oxidizin gas passage toprovide a series of pre eating jets around the outlet orifice of the oxidizing gas passa e.

As illustrated, passa es for fuel gas may e formed by milling o longitudinal portions of the cylindrical surface of the plug G so that when the latter is fitted in the shell S longitudinal passa es L will be formed extending, from the at G, to rovide an annular .groovejorming a mixlng chamber 0 within the tip. A series ofseparate' heating or fuel gas pass sages P are drilled through the lug from the chamber 0 to the outer end 0 the lug and are desirably inclined to the axis of the plug so that the gas jets therefrom may be concentrated more closely to the oxidizing jet from the oxidizing'gas passage 0. The gas passages P are severally counterbored, in the manner previously described, to provide an enlarged individual outlet orifice for each passage. By inclining the passages P. to the passage 0' it is possible to-project.

affording a more satisfactory operation of the preheating jets closer to the cutting jet,

' the blowpipe at a lessexpenditure of heat outer envelope of gas as it main ,assa'ge of smallersu stantially uni-- and gas. [The outlet orifices of the heating jets and oxidizing jets are desirabl disposed in the end face of the tip. In al types of tips there is a sudden expansion of the asses from the form ore abruptly into the counterbore, producinga decrease in jet velocity of this outer envelope and a softer flame.

I claim: A 1. A blowpipe tip having an oxidizing gas passage and a heating gas passage,-both passages extending to the end of said tip,

passage and 01: to provide separate enlarged outlet orifices the outlet orifices of said passages being disposed near one another and one of said orifices being counterbored.

.2. A tip for cutting blowpipes having an oxidizin gas passage and a eating gas passage inc ined thereto and terminatin in a counterbore adjacent the outlet ori ce of saidoxidizing gas passage. j

3. A blOWPlgf tip comprising a central gas er gas passages counterbored adjacent the outlet orifice of saidcentral passage.

ead end of the tip into. the shell. The plug G is desirably turneddown and tapered to an abrupt shoulder, as

a plurality of 6.. A blowpipe tip having a plurality of I gas passages, the delivery end of each passage disclTa'rgin centrally into a circular recess formed wit iin and extending rearward- I 1y from the forward end of the tip.

I. A tip for cutting blowpipes, such tip comprising an oxidizing gas passage. having its outlet orifice at the end of said tip, and a heating gas passage having a counterbored outlet orifice adjacent the outlet orifice of said'oxidizing gas passage. I

8. A tip for cutting blowpipes having means cooperative with means for coupling such tip'to a head or the like, said tip also having an oxidizin gas passage and a heating gas passage, t e outlet orifices of said passages being -disposed near one another and the outlet orifice of said heating passage being counterbored.

9. A'tip for cutting blowpipes comprising a shellhaving means cooperative with means for coupling said tip to a blowpipe head, and

a plug-insaid-she'll having an. oxidizing gas passage'and a heating gas passage, the outlet orifices of said passages being disposed near.

one another and the outlet orifice of said heatin passage being counterbored.

10. cutting blowpipe tip provided with a central passageway for cutting oxygen extending to the lower end thereof and a plurality of preheating passageways surrounding the first mentioned passageway, the delivery end of, each preheating. passageway discharging into a-recess formed within and extending upwardly from'the'lower end of the tip and about midway between the inner and outer edges of such recess, the upper end of said recess extending above the delivery end ofthe cutting oxygenpassageway. In testimony whereof. I aflix my signature.

' JAMES H. BUOKNAM. 

